build: add line break as soon tests are done

PR-URL: nodejs#24748
Refs: nodejs#24486
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

Author: BridgeAR

tools/test.py

@@ -383,7 +383,7 @@ def Starting(self):
     pass
 
   def Done(self):
-    self.PrintProgress('Done')
+    self.PrintProgress('Done\n')
 
   def AboutToRun(self, case):
     self.PrintProgress(case.GetLabel())